Magic the Gathering: The Spell Thief #4

Dack Fayden's quest to track down the villainous Sifa Grent has brought him to Grixis, a vast wasteland dominated by the undead and vicious demons-including the demon-dragon Malfegor. Imprisoned by the demon's cult, Dack soon discovers the morbid origins of Sifa and her sinister ties to Malfegor... but will he be able to escape this undead plane in order to stop her plans?